Sea Stars and Sea Urchins Operate Their Tube Feet by

question 49

Multiple Choice

Sea stars and sea urchins operate their tube feet by

• A)a water vascular system that regulates water pressure.
• B)cilia transporting hemolymph from chamber to chamber.
• C)sticky threads leading from the mouth and primitive brain.
• D)actin and myosin fibers that slide and give muscle actions to the five arms or "rays."

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